And you expected it to end well?! My wife would never take any of our cars to get any service done...
Mazda breaks up its maintenance schedules by the type of driving you do, not the type of oil you use.
Schedule one is for what is essential lighter use and the oil change interval (OCI) is every 7500 miles.
Schedule two is for short driving trips, towing, dusty conditions, etc... and the OCI is every 5000 miles.
The manual recommends 5W-20 Mazda Genuine or Castrol branded oil. It makes no mention of synthetic vs blend vs conventional.
https://www.mymazda.com/MusaWeb/sea...x=38&year=2012&action=search&y=6&modelId=1908
I take my cars to the dealer to show maintenance has been provided by a dealer who should be using genuine OEM parts to maintain the vehicle to the manufacturer's specs. If they aren't following/using what Mazda recommends than I would just soon take it somewhere else! Your dealer is a fail.
Having said that there is a big difference between walking in and saying, "I'd like and oil change." and "I'd like an oil change using the Mazda recommended 5W-20 conventional oil. Please indicate on your reminder sticker that the next oil change should be in 7500 miles because I am following Mazda's schedule 1 which is appropriate for the way we drive."
In the second instance most likely they won't try to up sell you on anything cause you have indicated them you aren't a lemming and you have taken the time to RTM. If they try to sell you on additional maintenance you tell them you will consult your manual first to see if is required by Mazda; if it isn't simply decline. They get declined all day long!
But keep in my mind the dealership exists to make money. The service adviser is there to up-sell. I took my Mustang in for an oil change and I asked for a quote to change the fuel filter. While I waited for the quote I Googled how much the part was and how to DIY. I could get the part for $16 to my door and it would take about 30 mins taking my time. They came back with $90 and said thanks but no thanks.
I talked to a former dealership manager and I asked him, "Why don't you lower your prices just a little to attract more business?" He said they price them at what their experience shows most people will pay. Maybe not everyone but enough people. He says that they figure if someone is taking their car to a dealer for an oil change they will likely pay the higher dealer prices on repair work. He is probably right in most cases. I only go for the documentation of maintenance history. Any real work I can't do myself I will take to a reputable independent repair shop; but I think I am in the minority.